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Diffstat (limited to 'src/mem/cache/miss/mshr.cc')
| -rw-r--r-- | src/mem/cache/miss/mshr.cc | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/mem/cache/miss/mshr.cc b/src/mem/cache/miss/mshr.cc new file mode 100644 index 000000000..73aeaf6ca --- /dev/null +++ b/src/mem/cache/miss/mshr.cc @@ -0,0 +1,182 @@ +/* + * Copyright (c) 2002-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Erik Hallnor + * Dave Greene + */ + +/** + * @file + * Miss Status and Handling Register (MSHR) definitions. + */ + +#include <assert.h> +#include <string> +#include <vector> + +#include "mem/cache/miss/mshr.hh" +#include "sim/root.hh" // for curTick +#include "sim/host.hh" +#include "base/misc.hh" +#include "mem/cache/cache.hh" + +using namespace std; + +MSHR::MSHR() +{ + inService = false; + ntargets = 0; + threadNum = -1; +} + +void +MSHR::allocate(Packet::Command cmd, Addr _addr, int _asid, int size, + Packet * &target) +{ + assert(targets.empty()); + addr = _addr; + asid = _asid; + + pkt = new Packet(); // allocate new memory request + pkt->addr = addr; //picked physical address for now + pkt->cmd = cmd; + pkt->size = size; + pkt->data = new uint8_t[size]; + pkt->senderState = this; + //Set the time here for latency calculations + //pkt->time = curTick; + + if (target) { + pkt->req = target->req; + allocateTarget(target); + } +} + +// Since we aren't sure if data is being used, don't copy here. +/** + * @todo When we have a "global" data flag, might want to copy data here. + */ +void +MSHR::allocateAsBuffer(Packet * &target) +{ + addr = target->paddr; + asid = target->req->asid; + threadNum = target->thread_num; + pkt = new Packet(); + pkt->addr = target->addr; + pkt->dest = target->dest; + pkt->cmd = target->cmd; + pkt->size = target->size; + pkt->req = target->req; + pkt->data = new uint8_t[target->size]; + pkt->senderState = this; +} + +void +MSHR::deallocate() +{ + assert(targets.empty()); + assert(ntargets == 0); + pkt = NULL; + inService = false; + allocIter = NULL; + readyIter = NULL; +} + +/* + * Adds a target to an MSHR + */ +void +MSHR::allocateTarget(Packet * &target) +{ + //If we append an invalidate and we issued a read to the bus, + //but now have some pending writes, we need to move + //the invalidate to before the first non-read + if (inService && pkt->cmd.isRead() && target->cmd.isInvalidate()) { + std::list<Packet *> temp; + + while (!targets.empty()) { + if (!targets.front()->cmd.isRead()) break; + //Place on top of temp stack + temp.push_front(targets.front()); + //Remove from targets + targets.pop_front(); + } + + //Now that we have all the reads off until first non-read, we can + //place the invalidate on + targets.push_front(target); + + //Now we pop off the temp_stack and put them back + while (!temp.empty()) { + targets.push_front(temp.front()); + temp.pop_front(); + } + } + else { + targets.push_back(target); + } + + ++ntargets; + assert(targets.size() == ntargets); + /** + * @todo really prioritize the target commands. + */ + + if (!inService && target->cmd.isWrite()) { + pkt->cmd = WriteReq; + } +} + + + +void +MSHR::dump() +{ + ccprintf(cerr, + "inService: %d thread: %d\n" + "Addr: %x asid: %d ntargets %d\n" + "Targets:\n", + inService, threadNum, addr, asid, ntargets); + + TargetListIterator tar_it = targets.begin(); + for (int i = 0; i < ntargets; i++) { + assert(tar_it != targets.end()); + + ccprintf(cerr, "\t%d: Addr: %x cmd: %d\n", + i, (*tar_it)->paddr, (*tar_it)->cmd.toIndex()); + + tar_it++; + } + ccprintf(cerr, "\n"); +} + +MSHR::~MSHR() +{ + if (pkt) + pkt = NULL; +} |